#include <algorithm>
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(), (x).end()
#define ll long long
#define ld long double
#define INF 1000000000000000000
typedef pair<ll, ll> pll;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    ll N;
    cin >> N;
    ll MOD = pow(10, 12);
    if (N >= 65) {
        cout << "000000000000" << endl;
        return 0;
    } else {
        ll sum = 1;
        for (int i = N; i > 0; i--) {
            sum *= i;
            sum %= MOD;
            if (sum == 0) {
                cout << "000000000000" << endl;
                return 0;
            }
        }

        cout << sum << endl;
    }
}